Icings near the Tibbitt to Contwoyto Winter Road, Great Slave Uplands, Northwest Territories
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Icings were investigated near the Tibbitt to Contwoyto Winter Road (TCWR) to examine the relation of overflow timing to air and ground temperature, rainfall, snow accumulation, and the winter road. Icings developed before the end of freezeback by intermittent overflow of water from upstream lakes. Open-system freezing in saturated peat caused build-up of hydraulic pressure, leading to overflow. The active layer remained hydrologically active after the overflow period but hydraulic pressures, possibly related to the upstream lake, were insufficient to cause further icings. The duration of the overflow period and spatial extent were positively related to autumn rainfall. In addition, above average early winter air temperature and average early winter snowfall were important factors contributing to overflows at several portages noted in the TCWR maintenance records. Development of icings in the Canadian Shield threshold-mediated hydrological regime is dependent on basin catchment area and antecedent conditions.
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Copyright © 2017 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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- 2017
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sladen-icingsnearthetibbitttocontwoytowinterroad.pdf | 2023-05-05 | Public | Download |